Journal of Applied Science, Engineering, Technology and Management

Surface Quality and Surface Integrity Aspects in Additive Manufacturing

2024-10-04T08:23:37+00:00

A REVIEW OF THE DESIGN AND DEVELOPMENT OF MICROSTRIP MULTIBAND BANDPASS FILTER FOR 5G SYSTEMS

2024-01-31T08:21:38+00:00

Microstrip bandpass filters have been the subject of research for a very long period to suit the needs of contemporary multiservice wireless communication systems. Multiband bandpass filters, or BPFs, are necessary for the receiver front end to work as a single unit that can serve many bands simultaneously. Particularly promising are the compact design, low integration cost, and simplicity of manufacture using printed circuit technology of planar bandpass filters. The design and implementation of filters for fifth-generation (5G) mobile communication systems is complicated due to the necessity for high integration, low cost, and high-speed data transfer. This paper offers and discusses a comprehensive assessment of existing research on microstrip single multiband bandpass filter designs for fifth-generation applications, with an emphasis on the most recent advances.

Transformative Pedagogy: Harnessing AI tools for Enhanced Powerpoint Creation in Educational Settings

2024-05-27T09:34:20+00:00

"Transformative pedagogy" refers to an approach to teaching and learning that goes beyond the transmission of information to encourage critical thinking, reflection, and the development of students as independent learners and responsible citizens. It aims to transform not only what students know but also how they think, interact with information, and engage with the world around them. integrating Artificial Intelligence (AI) into transformative pedagogy can amplify its impact by leveraging advanced technologies to enhance learning experiences. Artificial Intelligence (AI) in education refers to the application of advanced technologies, particularly machine learning, natural language processing, and data analytics, to enhance and transform various aspects of the educational process. The integration of AI in education holds the potential to revolutionize traditional teaching and learning methods, offering innovative solutions to address challenges and improve overall educational outcomes.

A survey on the need to incorporate rainwater harvesting systems as an alternative domestic water source in Ghana

2024-06-24T09:20:52+00:00

This research survey seeks to gather responses in rainwater gathering and storage using harvesting systems as a key alternative. About 502 responses were gathered. Averaging 8 persons per household and 6 rooms per household. 73.1 % of males and 26.9 females. The main source of water includes GWCL (37.8 %), Borehole/groundwater (59.6 %), both GWCL & Borehole (1 %), Both Rainwater & GWCL (1 %), other unspecified sources (0.6 %). 58.2 % responded ‘Yes’ to the collection of rainwater to 41.8 ‘No’ responses. Methods for collecting rainwater includes roof gutter & drain spouts (37.8 %), open containers (40.8 %), other unspecified means (14.7 %). 56.8 % said ‘YES’, with about 2 % saying ‘IF THE NEED BE’ and 41.2 % responding ‘NO’ to the need to collect rainwater for future use. Roofs age also contribute to water quality, 45.2 % were above 10 years, 30.7 % between 7-10 years, 14.3 % between 4-6 years and 9.8 % between 1-3 years. Furthermore, 65.3 % respondents had heard of rainwater harvester systems. About 75.7 % responded to ‘NO’ for not having rainwater systems installed. About 83.3 % responded ‘NO’ to treating the collected water before use. About 64.1% are willing to treat the harvested rainwater. About 61.4 % respondents indicated the reduction in their water bill. The t-statistic and P-value results suggested collecting rainwater does not appear to be associated with a difference in the number of rooms in a household. The Chi-square statistic of 14.394 and a P-value of 0.000148 establishes a strong association between collecting rainwater at the household during the rainy seasons and seeing a reduction in water bills during the rainy season compared to reliance on traditional water supplies alone. Households that collect rainwater are significantly more likely to see a reduction in their water bills. There is a growing interest in the gathering, harvesting and the purification of rainwater for domestic use as a great alternative.

Synthesis and Characterization of Zn-doped SnO2 Nanoparticles through Co-Precipitation Technique: A Comprehensive Analysis

2024-09-30T08:39:00+00:00

Tin oxide (SnO₂) nanoparticles are of significant interest due to their unique properties and diverse applications. In this study, pristine and Zn-doped SnO₂ nanoparticles (with Zn doping levels of 1.9 wt% and 3.7 wt%) were successfully synthesized using the co-precipitation method, followed by annealing at 500 °C for 5 hours. X-ray diffraction (XRD) analysis confirmed that all samples exhibited a tetragonal cassiterite structure, with crystallite sizes ranging from 22.5 nm to 28.2 nm, consistent with values obtained from the Williamson-Hall (W-H) plot. The nanoparticles demonstrated preferential orientation along the (110), (101), and (211) planes. Scanning Electron Microscopy (SEM) showed that the Zn-doped SnO₂ nanoparticles had a denser microstructure compared to the pristine samples. The energy band gap, as determined by diffuse reflectance spectroscopy, was found to be in the range of 3.10 eV to 3.16 eV. Fourier Transform Infrared (FTIR) spectroscopy revealed characteristic peaks at 459 cm⁻¹, 604 cm⁻¹, 924 cm⁻¹, 1976 cm⁻¹, 2117 cm⁻¹, and 3651 cm⁻¹, corresponding to the vibrations of various functional groups present in the material.

Structural and Morphological Studies of Electrospun Manganese-Doped Zinc Sulphide (ZnS: Mn) with Capping Agent L-citrulline/PVA Composite Nanofibers

2024-10-14T08:26:41+00:00

Materials in the form of fibers are of great practical and fundamental importance. Combination of a high specific area, flexibility, and superior directional strength make nanofiber a preferred material for many fields such as biomedical applications including drug delivery as well as scaffold formation. Manganese doped Zinc Sulphide with capping agent L-citrulline is blended with high molecular weight Poly Vinyl Alcohol (PVA) and the resulting solution is electro-spun to get non-woven nanofibers. Structural Characterization has been done by X-ray diffraction (XRD) and Fourier Transform Infra-Red Spectroscopy (FTIR). The fiber obtained is of good crystallinity as evidenced by the intense XRD peaks. The morphology is analyzed using a Scanning Electron Micrograph (SEM). The SEM micrographs reveal smooth fibers with several millimeters in length and average diameters in the range of 645 nm. Studies point to the possibility of using the prepared fibers for bio-medical applications.

Synthesis, Characterization, And Photocatalytic Application of Graphitic Carbon Nitride

2024-10-14T08:33:23+00:00

Graphitic Carbon Nitride (g-C₃N₄) is a polymeric semiconductor with a bandgap of 2.7eV, enabling it to absorb visible light. In this paper, g-C₃N₄ was synthesized by heating urea and thiourea separately for 2 hours at 550⁰C in a muffle furnace. The resulting products were named g-C3N4-U and g-C₃N₄-T, and investigated in terms of their crystal structure, morphology, and optical properties using X-Ray Diffractometer (XRD), Field Emission Scanning Electron Microscope (FESEM), UV-visible spectrophotometer, and Photoluminescence spectrometer. Brunauer-Emmett-Teller (BET) measurements were carried out to further observe the surface area, pore size, and pore volume of the as-prepared samples. The photocatalytic activity of the samples was investigated for pollution removal purposes, and its performance was examined under direct sunlight. The results showed that the urea-derived g-C₃N₄ exhibited better photocatalytic activity, with complete degradation of the target pollutant within 90 minutes.